Brazil's federal and state governments plan to sue the owners of the Samarco iron ore miner for 20 billion reais ($5.24 billion)in damages caused by the burst of a tailings dam, Environment Minister Izabella Teixeira told reporters on Friday.
Samarco is a joint venture between the world's largest mining company, BHP Billiton Ltd, and the biggest iron-ore miner, Vale SA.
The dam burst earlier this month unleashed 60 million cubic metres of mud and mine waste that devastated a village, killed at least 13 people and polluted a major river valley.
Teixeira said the suit would be filed on Monday. The proceeds would be put in a fund and used for environmental cleanup in the Rio Doce valley over 10 years, said Attorney General LuÃs InÃ¡cio Adams.
Samarco has already been fined 250 million reais by Brazil's environmental agency, Ibama, for the disaster, which covered the flood plain in mud for 80 km as well as polluting the river. Fish died and drinking water supplies for a quarter of a million people had to be closed off.
Ibama is planning additional fines against Samarco on top of the 20 billion reais in damages and clean-up charges the government is seeking, said Adams, but he did not specify an amount.
The dense orange sediment in the river reached the ocean on the weekend, hurting local tourist businesses.
The United Nations' human rights agency had said on Wednesday the mud from the dam burst was toxic, contradicting claims by Samarco and mine co-owner BHP Billiton that the water and mineral waste posed no risk to human health.
The minister announced the lawsuit after the close of the Sao Paulo stock market. The share price of co-owner Vale fell 5.78% on Friday.
Vale and BHP announced earlier on Friday they would create a fund with Samarco to help in the clean-up of the Rio Doce and its tributaries affected by the disaster. They did not detail the size of the recovery fund.